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Updated: Aug 21, 2026

A Simple Fecal Flotation Method for Diagnosing Zoonotic Nematodes Under Field and Laboratory Conditions
Published on: December 15, 2023
[Superficial infections caused by Microsporum canis in humans and animals]
Carolina Segundo1, Alejandrina Martínez, Roberto Arenas
1Sección de Micrología, Facultad de Medicina Veterinaria y Zootecnia, UNAM, México D.F., Mexico.
Abstract:
Dermatophytic infections caused by M. canis in humans and animals have a world wide distribution and they are zoonotic. The objective in this work was to know the frequency of M. canis infections in humans and pets. We studied our cases from January 1994 to December 2002. The human samples were obtained from a Dermatological Department in a General Hospital and we registered the next data: age, sex, job, and affected area. The animal samples were obtained from a mycological veterinary laboratory, and we registered the presence or absence of clinical lesions. A total of 46 clinical cases of M. canis infections were recorded, 26 female and 20 males: tinea capitis 21, tinea corporis 17, tinea pedis five, onychomycosis two, and only one case with tinea faciei. The 46 cases with positive culture yield 42 positive samples in KOH. The age range varied from 2 to 60 years. Among the animals, we studied 461 dogs and found six KOH positive (1%) samples and cultured 23 isolates (4.98%): 21 M. canis, one M. gypseum and one Trichophyton spp. From the 68 samples of cats, eight (11.76%) were positive to KOH, being 26 (38.23%) M. canis isolates. In M. canis infections in humans, the age rage was wide with predominance in women. In animals, M. canis isolates represented the most dermatophytic infection.
Insights
Microsporum canis (M. canis) infections are common zoonotic diseases in humans and pets. This study found M. canis to be the most frequent dermatophyte in both human and animal cases examined.
Area of Science:
- Medical Mycology
- Dermatophytosis
- Zoonotic Diseases
Context:
- Dermatophytic infections caused by Microsporum canis (M. canis) are globally prevalent and zoonotic.
- Understanding the frequency of M. canis in human and pet populations is crucial for public health.
- Previous studies highlight the significance of M. canis as a cause of dermatophytosis in companion animals and humans.
Purpose:
- To determine the prevalence of M. canis infections in human patients and companion animals.
- To analyze the demographic data and affected areas in human M. canis infections.
- To identify the frequency of M. canis among dermatophyte isolates from dogs and cats.
Summary:
- A total of 46 clinical cases of M. canis infections were recorded in humans (26 female, 20 male), with common presentations including tinea capitis and tinea corporis.
- Human infections ranged from 2 to 60 years of age, with a predominance in women.
- In animals, M. canis was the most common dermatophyte isolated. From 461 dogs, 4.98% yielded dermatophytes, including M. canis. From 68 cats, 38.23% of isolates were M. canis.
Impact:
- This research provides epidemiological data on M. canis infections, aiding in the understanding of its transmission dynamics between animals and humans.
- Findings can inform public health strategies and veterinary practices for the control and prevention of M. canis zoonoses.
- Highlights the importance of diagnosing and treating M. canis in companion animals to reduce human exposure and infection rates.
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